//
// Created by 相开原 on 2022/3/24.
//
#ifndef MD5_H
#define MD5_H

#include <memory.h>
#include <string.h>
#include <stdio.h>

typedef struct {
    unsigned int count[2];
    unsigned int state[4];
    unsigned char buffer[64];
} MD5_CTX;


#define F(x, y, z) ((x & y) | (~x & z))
#define G(x, y, z) ((x & z) | (y & ~z))
#define H(x, y, z) (x^y^z)
#define I(x, y, z) (y ^ (x | ~z))
#define ROTATE_LEFT(x, n) ((x << n) | (x >> (32-n)))
#define FF(a, b, c, d, x, s, ac) \
          { \
          a += F(b,c,d) + x + ac; \
          a = ROTATE_LEFT(a,s); \
          a += b; \
          }
#define GG(a, b, c, d, x, s, ac) \
          { \
          a += G(b,c,d) + x + ac; \
          a = ROTATE_LEFT(a,s); \
          a += b; \
          }
#define HH(a, b, c, d, x, s, ac) \
          { \
          a += H(b,c,d) + x + ac; \
          a = ROTATE_LEFT(a,s); \
          a += b; \
          }
#define II(a, b, c, d, x, s, ac) \
          { \
          a += I(b,c,d) + x + ac; \
          a = ROTATE_LEFT(a,s); \
          a += b; \
          }

void MD5Init(MD5_CTX *context);

void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen);

void MD5Final(MD5_CTX *context, unsigned char digest[16]);

void MD5Transform(unsigned int state[4], unsigned char block[64]);

void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len);

void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len);

void MD5_get(char *, char *);

#endif  //I_SHOP_MD5_H
